La对Sr变质A356铝合金铸态组织与力学性能的影响
Effects of La on As-cast Microstructure and Properties of Sr Modified A356 Alloy
何兵 1覃铭 1石伟和 1古斌1
作者信息
- 1. 百色学院材料科学与工程学院,百色 533000;百色学院生态铝产业学院,百色 533000;广西壮族自治区铝基新材料工程研究中心,百色 533000
- 折叠
摘要
研究不同含量Sr、La对A356合金铸态组织与力学性能的影响.通过电阻炉熔铸合金,运用XRD、金相显微镜、扫描电镜对铸态组织、断口进行观测,并结合力学性能测试进行分析.结果表明,Sr+La组合能有效地细化变质A356合金铸态组织,达到提高其力学性能的效果.其中,添加0.05％的Sr+0.3％的La对合金组织的细化变质及力学性能的改善效果最佳;当La添加量达到0.5％后,铸态组织出现富La粗大相,降低其力学性能.
Abstract
Effects of different Sr and La contents on as-cast microstructure and mechanical properties of A356 alumi-num alloy were investigated.A356 aluminum alloy was melted in electric furnace,and the as-cast microstructure and fracture morphologies were characterized by XRD,metallographic microscopy,and scanning electron microscopy,meanwhile mechanical properties were analyzed.The results indicate that the combination addition of Sr+La can effec-tively refine as-cast structure of A356 aluminum alloy,achieving the improvement of mechanical properties,and the optimal refinement and modification are realized with 0.05％Sr+0.3％La addition.However,when the amount of La exceeds 0.5％,coarsened La-rich phases appear,which is harmful to mechanical properties.
关键词
A356铝合金/变质/力学性能/断口形貌Key words
A356 Aluminum Alloy/Modification/Mechanical Properties/Fracture Morphology引用本文复制引用
出版年
2024
NETL
NSTL
万方数据